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13-08-2017
Mathematics

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use rounding or compatible numbers to estimate the sum of 63+71

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kphung76127 kphung76127

13-08-2017

Since both are 2 digit numbers, round to the nearest tens place.

63 round to 60 since 3 is less than 5.
71 round to 70 since 1 is less than5.

Add the rounded numbers.

60+70=130

Final answer: 130

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